WO2007003091A1 - Méthode de protection de service span-ring dans un réseau optique - Google Patents

Méthode de protection de service span-ring dans un réseau optique Download PDF

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Publication number
WO2007003091A1
WO2007003091A1 PCT/CN2006/001224 CN2006001224W WO2007003091A1 WO 2007003091 A1 WO2007003091 A1 WO 2007003091A1 CN 2006001224 W CN2006001224 W CN 2006001224W WO 2007003091 A1 WO2007003091 A1 WO 2007003091A1
Authority
WO
WIPO (PCT)
Prior art keywords
ring
node
cross
path
service
Prior art date
Application number
PCT/CN2006/001224
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English (en)
Chinese (zh)
Inventor
Guangjun Wang
Original Assignee
Huawei Technologies Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to CNA2006800123397A priority Critical patent/CN101160767A/zh
Priority to US10/592,293 priority patent/US7639944B2/en
Priority to EP06742110A priority patent/EP1804406A4/fr
Publication of WO2007003091A1 publication Critical patent/WO2007003091A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0278—WDM optical network architectures
    • H04J14/0283—WDM ring architectures
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0278—WDM optical network architectures
    • H04J14/0284—WDM mesh architectures
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0278—WDM optical network architectures
    • H04J14/0286—WDM hierarchical architectures
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0287—Protection in WDM systems
    • H04J14/0289—Optical multiplex section protection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0287—Protection in WDM systems
    • H04J14/0293—Optical channel protection
    • H04J14/0294—Dedicated protection at the optical channel (1+1)
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0287—Protection in WDM systems
    • H04J14/0293—Optical channel protection
    • H04J14/0295—Shared protection at the optical channel (1:1, n:m)
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0079—Operation or maintenance aspects
    • H04Q2011/0081—Fault tolerance; Redundancy; Recovery; Reconfigurability
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/009—Topology aspects
    • H04Q2011/0092—Ring

Definitions

  • the present invention relates to the field of optical communication technologies, and in particular, to a method for protecting a cross-ring service in an optical network. Background technique
  • the topology of the optical network has evolved from isolated nodes to linear topology networks to ring topology networks. At present, many networks have the topology of Mesh Network or quasi Mesh.
  • the optical network 10 shown in Fig. 1 includes a plurality of nodes 11 interconnected by a mesh topology. Protection switching technology is also developing in tandem with the evolution of the network.
  • the ITU standards such as G.783, G.841, and G.842 recommend protection methods for chain networks and ring networks, such as multiplex section protection MSP (Multiplex Section Protection) l+l, MSP1:N, unidirectional channel.
  • MSP Multiplex Section Protection
  • MSP1:N unidirectional channel.
  • the Unidirectional Path Switched Ring (UPSR) and the Bi-directional Line Switching Ring (BLSR) have been widely used.
  • the protection of the transmission plane is mainly based on linear protection and ring protection.
  • the method of dual node interconnection is mainly adopted.
  • the DNI method is a waste of resources, and has certain requirements for the network structure, that is, the two-node interconnection is generally required, and the configuration work is also complicated.
  • a ring composed of nodes 21, 22, and 23 and a ring composed of nodes 24, 25, and 26 pass through a pair of nodes. 23, 24 and node pairs 22, 25 interconnected.
  • all the services are configured as SNCP services, and at the same time, the services are silently transmitted on the nodes of the upper ring and the two interconnected nodes of the ring, and the two interconnected nodes on the other ring and The selection of the business is performed on the lower node of the service of the other ring.
  • the cross-ring services in this solution need to be equipped with Hanfa, they consume a lot of bandwidth resources, and the configuration process is complicated.
  • the scheme is only applicable to the case of two-node interconnection, and cannot be effectively protected if the ring and the ring have only a single node interconnection or no shared node.
  • the method is mainly in mutual
  • the dual-issue of the service is performed on the local ring node of the connection, and the election is performed on the same-side interconnection node on the other ring.
  • the configuration process of the method is complicated (requires artificial configuration), and the bandwidth occupation on the multiplex section ring is relatively serious (especially when the interconnecting node is not an adjacent node on the ring).
  • this scheme is also only applicable to the case of Han node interconnection, and can not be effectively protected if the ring and the ring have only a single node interconnection or no shared node.
  • the present invention provides a method for protecting a cross-ring service in an optical network, so as to overcome the defects of low bandwidth utilization and strict requirements on the network topology when the existing cross-ring service uses the Han node interconnection method, and the cross-ring service in the optical network is implemented. Get effective protection.
  • the technical solution of the present invention is to provide a method for protecting a cross-ring service in an optical network, which includes the following steps:
  • the cross-ring protection path is established, and the cross-ring protection path is bound to the working path, and the cross-ring protection path bypasses the outgoing ring node or the ring-entry node of the working path on the ring. .
  • the method further includes:
  • the cross-ring protection path is established by using a resource reservation protocol-traffic engineering protocol, an open shortest path first-first traffic engineering protocol, or an intermediate system-intermediate system-traffic engineering.
  • the method also includes the steps of:
  • the node that selects the service in the working path and the cross-ring protection path performs the selection of the service point transfer according to the switching state of the ring.
  • the selected node When the ring in which the selected node is located is running normally, the selected node is in the working path and the cross Ring protection path selection service.
  • the selective receiving node selects the service in the in-loop protection path and the cross-ring protection path.
  • the selective node selects the service in the ring reverse protection path and the cross-ring protection path.
  • the working path and the cross-ring protection path are protected by 1+1 protection or 1:1.
  • the working path spans a single node ring interconnect, a two node ring interconnect, or a ring that spans no common node.
  • the method for protecting the cross-ring service in the optical network of the present invention achieves the protection of the service of the ring that is interconnected across the single node by establishing a cross-ring protection path and binding the cross-ring protection path with the working path.
  • the relatively dual-node interconnection of the present invention can reduce the use of bandwidth resources on the multiplex section ring and improve the bandwidth usage rate.
  • the present invention can also implement service protection of a ring that is interconnected by a two-node or a ring that does not have an interconnection node, thereby effectively protecting the cross-ring service in the optical network.
  • FIG. 1 is a schematic diagram of a topology structure of a mesh network in the prior art
  • FIG. 2 is a schematic diagram of a two-node interconnection of a subnet connection protection ring according to the prior art
  • FIG. 3 is a schematic diagram of a layered architecture of an optical network
  • FIG. 4 is a schematic diagram of a service path according to an embodiment of the present invention.
  • Figure 5 is a schematic structural view of a node G in Figure 4.
  • FIG. 6 is a flowchart of a method for protecting a cross-ring service in an optical network according to an embodiment of the present invention
  • FIG. 7 is a detailed flowchart of a step of planning a cross-ring protection path in FIG. DETAILED DESCRIPTION OF THE INVENTION
  • the general optical network is composed of three logical planes, that is, a transport plane 33, a control plane 32, and a management plane 31.
  • the control plane 32 and the transport plane 33 are respectively connected to the management plane 31, and the control plane 32 and the transport plane 33 are connected by a connection control interface 34.
  • the transport plane 33 is composed of transport network nodes 331 as switching entities, which are connected to each other by a subnet connection 332.
  • the transport plane 33 performs functions such as connection/disconnection, switching (routing), and transmission to provide bidirectional or one-way information transfer from one endpoint to another, as well as some control and network management information transfer.
  • the control plane 32 implements functions such as call control and connection control in the intelligent optical network.
  • the control plane 32 is supported by a signaling network and is comprised of a variety of functional components, including a set of communication entities and control units 322 (e.g., optical connection controllers) and corresponding internal network node interfaces 324.
  • the communication entities and control units 322 respectively form a plurality of management domains 321 which are interconnected by an external network node interface 323.
  • the communication entity and control unit 322 is primarily used to invoke the resources of the transport network to provide functionality related to the establishment, maintenance, and teardown of the connection (release of network resources). The most important of these functions is the signaling function and routing function.
  • control plane 32 is also coupled to request agent 36 via a user network interface. The protection method of the cross-ring service of the present invention is performed by the control plane 32.
  • the management plane 31 manages the control plane 32 and the transport plane 33, and provides a more efficient communication function between the network operating system and the node 331 while providing management of the optical transport network and the node 331.
  • FIG. 4 it is a schematic diagram of a service path of an embodiment of the present invention.
  • the solid line in the figure indicates the path with ring protection, and the broken line indicates the path without ring protection.
  • nodes A, B, and E form the first ring
  • nodes E, F, H, I, J, and G form the second ring
  • the first ring and the second ring are interconnected by a single node E.
  • the control plane 32 first configures the working path, that is, the path AEGJ in FIG. 4 (step S61).
  • the configuration of the working path can be switched by universal multi-protocol label (GMPLS, Generalized Multi-Protocol Label Switching) resource reservation protocol - RSVP - TE (Resource Engineering Protocol - Traffic Engineering) protocol, Open Shortest Path First Traffic Engineering (0SPF-TE) protocol, Intermediate System - Intermediate System - Traffic Engineering (ISIS-TE) implementation.
  • GPLS Generalized Multi-Protocol Label Switching
  • RSVP - TE Resource Engineering Protocol - Traffic Engineering
  • SPF-TE Open Shortest Path First Traffic Engineering
  • ISIS-TE Intermediate System - Intermediate System - Traffic Engineering
  • step S65 If the service sending node is located in the same ring as the service receiving node, go to step S65 to perform in-loop multiplex section protection planning on the two rings respectively (step S65). If the service sending node is not in the same ring as the service receiving node, the control plane 32 performs cross-ring protection routing planning on two adjacent nodes on the working path on both sides of the node E interconnected by the two rings (using RSVP-TE, OSPF) - TE or ISIS-TE protocol), establish a cross-ring protection path bypassing node E according to the actual usage of the bandwidth, and bind the cross-ring protection path to the corresponding section of the working path, where the corresponding section of the working path It has the same starting node as the cross-ring protection path and includes the node E (step S63), which will be described in detail with reference to FIG.
  • the cross-ring protection path (assumed to be the path AFG) performs 1+1 cross-ring service protection, 1+1 protection: the service is completely disjoint in two Simultaneous transmission on the channel/link (working channel/link and protection channel/link), selecting a good quality signal at the receiving end; or 1:1 protection: The service is only transmitted on the working channel/link, The protection channel/link does not transmit traffic or transmits low-priority services. When the working channel/link fails, the service is switched from the working channel/link to the protection channel/link, while the protection channel/link is protected. Low priority business is abandoned.
  • the in-loop service protection (multiplex section protection) is performed.
  • the order of the in-loop multiplex section protection planning and the cross-ring protection path planning may also be reversed from the sequence shown in FIG. 6.
  • the first node in the first ring is different from the outgoing node (the node E in this embodiment), and the second ring is selected to be different from the incoming node (also in the embodiment as the node E).
  • the second node Referring to FIG. 4, assuming that there are available bandwidth resources on the AF and FG, the first node may be a node, and the second node may be a node G, where the first node and the second node are located on the working path, that is, the path AEGJ ( Step S71).
  • control plane 32 can be established from the first node (node A) to a cross-ring protection path of the second node (node G) (step S72), and binding the cross-ring protection path AFG with the AEG segment of the working path, so that the path between the AFG and the AEG is protected by 1 + 1 (Step S73).
  • the first node may be node A
  • the second node may be node G
  • the cross-ring protection path may be path ABG.
  • the cross-ring protection path may include a plurality of intermediate nodes in addition to the first and second nodes.
  • Techniques such as OSPF-TE (Open Shortest Path First - Traffic Engineering) can be used to implement protection path configuration based on constraint information and bandwidth usage status of each link.
  • the protection can also be implemented by the above method. The difference is that the outgoing node and the incoming node do not coincide.
  • the service can be re-sent at node A, and the service is selected at node G.
  • the path A G replaces the path AEG to implement the service path switching.
  • the transfer of the selected service point needs to be performed, that is, the node G needs to select a good quality service from the service on the protection channel EFHIJG corresponding to the work path EG corresponding to the switching and the service on the AFG, as shown in FIG. 5 Show.
  • the node G includes a service transceiver module 41, and is coupled with a westward working channel 42, a westward protection channel 43 (inward ring protection channel), an east working channel 45, and an eastward protection channel 46 (inside loop protection) Channel) connection.
  • the service path AEGJ is transmitted in the west working channel 42; when the second ring EFHIJG is in the segment EG, the service on the working path AEGJ is switched to the westward protection channel 43. All services of G to J on the second ring EFHIJG are transmitted on the east working channel 45; when the second ring EFHIJG is ring-switched in the segment EG, the services of E to G will be received on the east protection channel 46.
  • the node G is also connected to the cross-ring protection channel 44 to implement protection across the ring service when the ring interconnect node E fails.
  • the node G selects the service for the service in FIG. 4: when the EG segment of the second ring EFHIJG does not have protection switching, the service transceiver module 41 selects a service from the west to the working channel 42 and the west to the protection channel 43.
  • the service receiving module 41 selects the service reception in the westward protection channel 43 and the cross-ring protection channel 44, and transmits it to the east working channel 45; the EG zone of the second ring EFHIJG In the case where the segment is subjected to the ring protection switching, the service transceiver module 41 selects a service in the cross-ring protection channel 44 and the east-facing protection channel 46 to receive and transmit it to the east working channel 45.
  • the corresponding segment switch is performed to switch the service on the faulty working path to the corresponding protection channel. Therefore, it is only necessary to occupy the working path AEGJ (or the corresponding in-loop protection path) or the bandwidth corresponding to the service on the path AFG.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Small-Scale Networks (AREA)
  • Optical Communication System (AREA)

Abstract

La présente invention concerne une méthode de protection de service span-ring dans un réseau optique comprenant les étapes suivantes : juger si le chemin de service configuré recouvre différents anneaux ; si le chemin de service recouvre des anneaux, établir le chemin de protection de span-ring et lier le chemin de protection de span-ring au chemin de service, le chemin de protection de span-ring ne traversant pas le nœud egress ou le nœud ingress du chemin de service. La méthode de protection implémente la protection de span-ring lorsque le nœud egress et le nœud ingress sont invalides en établissant la liaison du chemin de protection de span-ring et du chemin de service et la méthode peut réduire la largeur de bande par rapport à la méthode conventionnelle DNI.
PCT/CN2006/001224 2005-07-06 2006-06-06 Méthode de protection de service span-ring dans un réseau optique WO2007003091A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CNA2006800123397A CN101160767A (zh) 2005-07-06 2006-06-06 一种光网络中跨环业务的保护方法
US10/592,293 US7639944B2 (en) 2005-07-06 2006-06-06 Method for protecting cross-ring service in optical network
EP06742110A EP1804406A4 (fr) 2005-07-06 2006-06-06 Méthode de protection de service span-ring dans un réseau optique

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN200510035874.1 2005-07-06
CNB2005100358741A CN100459553C (zh) 2005-07-06 2005-07-06 光传输网中跨环业务的保护方法

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WO2007003091A1 true WO2007003091A1 (fr) 2007-01-11

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PCT/CN2006/001224 WO2007003091A1 (fr) 2005-07-06 2006-06-06 Méthode de protection de service span-ring dans un réseau optique

Country Status (4)

Country Link
US (1) US7639944B2 (fr)
EP (1) EP1804406A4 (fr)
CN (2) CN100459553C (fr)
WO (1) WO2007003091A1 (fr)

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KR100875934B1 (ko) * 2007-06-25 2008-12-26 한국전자통신연구원 멀티링 네트워크 운영방법 및 장치
US8203932B2 (en) * 2008-12-02 2012-06-19 Electronics And Telecommunications Research Institute Method and system for protection switching in ethernet ring
CN101877665B (zh) * 2009-04-29 2013-12-18 华为技术有限公司 环网保护方法、网络节点及环网络
US8977123B2 (en) * 2011-08-17 2015-03-10 Nec Laboratories America, Inc. 2-step-optimization procedure for routing and wavelength assignment with combined dedicated shared protections in multi-cable multi-fiber optical WDM networks
US9246627B2 (en) * 2011-08-17 2016-01-26 Nec Laboratories America, Inc. Joint optimization procedure for routing and wavelength assignment with combined dedicated shared protections in multi-cable multi-fiber optical WDM networks
CN103095478B (zh) * 2011-11-03 2016-12-28 中兴通讯股份有限公司 一种跨环业务的保护方法及装置
CN102546425B (zh) 2012-01-31 2014-11-05 华为技术有限公司 相交环保护方法、设备和系统

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Also Published As

Publication number Publication date
CN1893385A (zh) 2007-01-10
EP1804406A1 (fr) 2007-07-04
CN101160767A (zh) 2008-04-09
CN100459553C (zh) 2009-02-04
US7639944B2 (en) 2009-12-29
US20080232802A1 (en) 2008-09-25
EP1804406A4 (fr) 2008-04-23

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